Method and arrangement for adjusting reported channel quality in multi-hop wireless communication system
First Claim
1. A method at a base station configured for operation in a multi-hop wireless communication system that includes a relay node that operates in a first transmission mode at certain times and operates in a second transmission mode at certain other times, said method comprising:
- obtaining a channel quality indicator value that indicates a downlink channel quality between the base station and a user equipment served by the base station, for a measurement time that coincides with the relay node operating in one of the first and second transmission modes; and
controlling a downlink transmission from the base station to the user equipment as a function of the channel quality indicator value, if the transmission mode of the relay node at a transmission time of the downlink transmission matches the transmission mode of the relay node at the measurement time, and otherwise controlling the downlink transmission as a function of an adjusted channel quality indicator value, including determining the adjusted channel quality indicator value as a function of the channel quality indicator value and a channel quality indicator offset value that accounts for differences between the first and second transmission modes in relay-caused downlink interference.
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Accused Products
Abstract
Method and arrangement in a base station for adjusting a channel quality indicator value of a wireless transmission between the base station and a user equipment. The base station, the user equipment and a relay node are comprised in a multi-hop wireless communication system and adapted to intercommunicate in a first transmission mode and a second transmission mode. The method comprises sending a radio signal to be received by the user equipment, obtaining a measurement of the channel quality indicator value, determining if the transmission mode of the sent radio signal is different from the transmission mode of the obtained channel quality indicator value measurement, and adding a channel quality indicator offset value to the channel quality indicator value, if the transmission mode of the relay node is determined to be the first transmission mode while the channel quality indicator was measured and obtained in the second transmission mode.
8 Citations
14 Claims
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1. A method at a base station configured for operation in a multi-hop wireless communication system that includes a relay node that operates in a first transmission mode at certain times and operates in a second transmission mode at certain other times, said method comprising:
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obtaining a channel quality indicator value that indicates a downlink channel quality between the base station and a user equipment served by the base station, for a measurement time that coincides with the relay node operating in one of the first and second transmission modes; and controlling a downlink transmission from the base station to the user equipment as a function of the channel quality indicator value, if the transmission mode of the relay node at a transmission time of the downlink transmission matches the transmission mode of the relay node at the measurement time, and otherwise controlling the downlink transmission as a function of an adjusted channel quality indicator value, including determining the adjusted channel quality indicator value as a function of the channel quality indicator value and a channel quality indicator offset value that accounts for differences between the first and second transmission modes in relay-caused downlink interference. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An arrangement in a base station configured for operation in a multi-hop wireless communication system that includes a relay node that operates in a first transmission mode at certain times and operates in a second transmission mode at certain other times, said arrangement comprising:
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an obtaining unit configured to obtain a channel quality indicator value that indicates a downlink channel quality between the base station and a user equipment served by the base station, for a measurement time that coincides with the relay node operating in one of the first and second transmission modes; a sending unit configured to control a downlink transmission from the base station to the user equipment as a function of the channel indicator value, if the transmission mode of the relay node at a transmission time of the downlink transmission matches the transmission mode of the relay node at the measurement time, and otherwise control the downlink transmission as a function of an adjusted channel indicator value; a determining unit configured to determine whether or not the transmission mode of the relay node at the transmission time matches the transmission mode of the relay node at the measurement time; and an adjusting unit to obtain the adjusted downlink channel quality indicator value as a function of the channel quality indicator value and a channel quality indicator offset value that accounts for differences between the first and second transmission modes in relay-caused downlink interference. - View Dependent Claims (12, 13, 14)
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Specification